fix: Support file URIs in ProcessingStep's code parameter

[staubhp]

Issue #, if available:
N/A

Description of changes:
ProcessingStep hashes the contents of local files passed to code to fix cache miss issues. Update the hash function to support file URIs.

Testing done:
Unit, manual

Merge Checklist

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: cff17b9
• Result: FAILED
• Build Logs (available for 30 days)

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[codecov-commenter]

Codecov Report

Merging #3051 (599a782) into master (6ce11cb) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3051      +/-   ##
==========================================
- Coverage   89.47%   89.39%   -0.08%     
==========================================
  Files        1028      196     -832     
  Lines       84153    16660   -67493     
==========================================
- Hits        75294    14894   -60400     
+ Misses       8859     1766    -7093     

Impacted Files	Coverage Δ
src/sagemaker/workflow/utilities.py	100.00% <100.00%> (ø)
...ython3.7/site-packages/sagemaker/lineage/_utils.py
...ages/sagemaker/feature_store/feature_definition.py
...hon3.7/site-packages/sagemaker/sparkml/__init__.py
...y36/lib/python3.6/site-packages/sagemaker/tuner.py
...site-packages/sagemaker/debugger/metrics_config.py
.../python3.8/site-packages/sagemaker/cli/__init__.py
.../site-packages/sagemaker/huggingface/processing.py
...hon3.6/site-packages/sagemaker/sparkml/__init__.py
.../lib/python3.6/site-packages/sagemaker/pipeline.py
... and 823 more

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-unit-tests
• Commit ID: 599a782
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: cff17b9
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[sagemaker-bot]

AWS CodeBuild CI Report

• CodeBuild project: sagemaker-python-sdk-local-mode-tests
• Commit ID: 599a782
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository